How so? You can do anything you want. This idea that parents can't found companies is just a platitude that childless entrepreneurs (usually very young ones I might add) use to justify their insane work schedules. The belief that this is the only way to do it protects their egos from the thought they may be working their way to an early grave.

The uncomfortable truth is that 100 hours a week won't guarantee you success, and 20 hours a week may be sufficient to build a serious business. Every extra hour your work is multiplying the base value of your idea, expertise, connections and staff, but it is not going to magically cross some threshold of success when you put yourself on a perpetual deathmarch. If anything, I think those 70th, 80th, 90th hours tend to have dramatically diminishing returns, and time away from the office helps refuel creativity and lead to more intelligent decision making and recognition of opportunities.

Of course that's all just my opinion, but one thing I'm sure of: no successful entrepreneur got there without challenges, and they certainly never got there listening to the million reasons the rest of us said it wasn't possible.